The texture for this asset has been created in ZBrush, baked with MightyBake and textured with Photoshop.
The geometry has been modeled and UVed in Maya.
The flower texture is of a neutral color so that I can multiply any color I want in Unreal.
More details on the "Foliage" master material here: https://www.artstation.com/artwork/b6Lag
Marmoset Viewer - Blue glow color example (the coloring result is quite different compared to Unreal)